The Symposium starts with dialogues between Eryximachus and Phaedrus, where he proposes that "as good a speech in praise of love as he is capable of giving" (Symposium176e-177d). In return, Socrates ignites the discussion by mentioning that the only thing he understands is "the art of love" (Symposium177e).
According to Aristophanes the unification between a man and a woman results in an offspring whereas the unification between a man and man results in pure satisfaction with no other strings attached (Symposium, 191c-d) Thus, according to Aristophanes it is natural for a human being to pursue pure love where love actually "is the name for our pursuit of wholeness, for our desire to be complete" (Symposium192e-193a).
Aristophanes' idea of human civilization is based on this love which is in its complete sense and this idea of love is the constant source of inspiration that makes the greatest of arts and formulates history (Symposium193c). Aristophanes also makes comments that devise the idea that the lovers with no strings attach are not able to evoke more desire as there is no structure of desire and the lovers would not be able to state anything substantial out of this union because they were unable to state what they did desire. According to Aristophanes this is the basic shortfall of human love but mentions that the desire to unite one's soul with its other half is what love truly is.
Similarly, Alcibiades states that he is basically homosexual in nature because he's crazy about beautiful boys and it is in his nature that he pursues for their love whenever and wherever it is possible (Symposium216d). ...